AD5933YRSZ

AD5933YRSZ FEATURES

Programmable output peak-to-peak excitation voltageto a maximum frequency of 100 kHzProgrammable frequency sweep capability withserial I2C interfaceFrequency resolution of 27 bits (<0.1 Hz)Impedance measurement range from 1 kΩ to 10 MΩCapable of measuring of 100 Ω to 1 kΩ with additionalcircuitryInternal temperature sensor (±2°C)Internal system clock optionPhase measurement capabilitySystem accuracy of 0.5%2.7 V to 5.5 V power supply operationTemperature range: −40°C to +125°C16-lead SSOP packageQualified for automotive applications

AD5933YRSZ GENERAL DESCRIPTION

The AD5933 is a high precision impedance converter systemsolution that combines an on-board frequency generator witha 12-bit, 1 MSPS, analog-to-digital converter (ADC). Thefrequency generator allows an external complex impedance tobe excited with a known frequency. The response signal fromthe impedance is sampled by the on-board ADC and a discreteFourier transform (DFT) is processed by an on-board DSPengine. The DFT algorithm returns a real (R) and imaginary (I)data-word at each output frequency.Once calibrated, the magnitude of the impedance and relativephase of the impedance at each frequency point along the sweepis easily calculated. This is done off chip using the real andimaginary register contents, which can be read from the serialI2C interface.A similar device, also available from Analog Devices, Inc., is theAD5934, a 2.7 V to 5.5 V, 250 kSPS, 12-bit impedance converter,with an internal temperature sensor and is packaged in a 16-lead SSOP.

AD5933YRSZ APPLICATIONS

Electrochemical analysisBioelectrical impedance analysisImpedance spectroscopyComplex impedance measurementCorrosion monitoring and protection equipmentBiomedical and automotive sensorsProximity sensingNondestructive testingMaterial property analysisFuel/battery cell condition monitoring